Swab-release mechanism



July 2, 1929. H. R. STANDLEE SWABRELEASE MECHANISM Filed Aug. 26, 1926 glvwemtor Patented July 2, 1929.

warren STATES PATENT orricn.

HARVEY R. STANDLEE, OF TULSA, OKLAHOMA.

SWAB-RELEASE MECHANISM.

Application filed August 1526.

The pro-tint. inveutioi'i relates to improvcments in swaliis utilized in connection with the production of crude oil.

The object of the present invention to provide an attaclnnent tor a device of this character which will eliminate the possibility o'l injury to the well due to the over-loading; of the wire line in instances where the swab is run too deeply, as the breaking of the wire line may cause the lining of the swab in the casing w'th the result that it will be necessary to pull the casing to remove the same. By means of the present invention the swab continuously bleeds whereby the load reaches a predetcrinined weight that the wire line can pull.

Other features and objects will more clearly hereinafter appear by reference to the acconn panying drawings, forming: a part o'l. this specification and wherein like numerals o't reference designate corresponding parts throughout the several views, in which:

Figure 1 a vertical sectional view of my present device in position on a swab.

Figure 2 is a similar view of the valve mechanism taken through the valve at right angles to Figure 1.

Figure 3 is a bottom plan view, and.

Figure at is a transverse section on line ll of Figure 2.

Referring to Figure 1, the swab is indi cated by the reference character It and is provided with the usual central tubular conduit a threaded at its lower end to receive the upper threaded portion l of the over-load valve assembly.

lhis valve assembly includes a casing}; tuhulair in character and coniprisinu upper section 2 and lower section 3. The reduced threaded portion 4; of the section 3 is threaded into the lower threaded portion 5 oi the upper section 2. The upper threaded portion l of the assembly is reduced in diameter Zltljlll'tlll t its extremity and the lower ptn'tion oil. the assembly is similarly constructed and is threaded intcrnall as at 6 for any necessary connection.

lhe inner upper face 7 ot the reduced portion 4t of the lower valve easing section is beveled inwardly at an angle of 46 to form an annular valve seat for the reception of a valve 8 hereinafter described.

The valve assembly includes in addition to the casing, the downwardly seating valve 8 and the upwardly seating valve 9 the latter Serial No. 131,767.

seating, against the valve seat 10 'liorined on the inner face oil the downwardly seating valve 8. This valve 8 in annular term and is provided with the two faces, the valve seat 10 heretofore mentioned and the valve face 11. which seats against the valve seat '2' itin'ined on the inner face of the reduced portion l. The valve 9 closes the opening tornied, due to the annular SlTIUUtUlG of the valve 8. This valve 9 is secured to the valve stem 12, the upper and lower extremities oi which extend and slide th rou 'h central perforations formed through the ii xegral web ortions ll and ot the casing sec ions 53 and 3, resauiectiv'clv. 'lfhese web portions 14: and to are located. iiiward ly from and adjacent to the reduced portions oi? the casii'ip; sections. For centeriinr the valve 8 with respect to the valve 9 the forinecis provided with the transverse web 16 enlarged centrally at 17 to arc-onnnodate the central opening 18, through which the stem passes. The valve 8 is provided with the. diainetri :ally opposite guide tlan igee 19 which extend upwardly troni the valve hodv at points flush with the inner :uljacent edge of the valv seat 10. An upwardly extending circular guide flange 20 is formed inilnediately adjacent the opening for the valve stem. A screen 21 oil? tubular form is arranged so that its lower opened end snugly cngages the outer face ot the flange '19. This screen partially closed at its upper end by means of the integral ca 2]. thirnicd with h central oi iening through which the valve stem 12 passes. The valve stem adjacent this opening in the cap 2i screw threaded to accoinn'lodate the lock nut which acts as a stop to limit the upward movement of the screen. This .aercon is normally under tension by means of the spiral cpl-inn .55. the lower end of which is positioned between the zuljacent walls of the flanges 11) and ill and the upper end of Wl'lltfll is posit ioncd by means of the downwardly extending; flange Add torincd integral with the cap it adjacent the central opening therein.

Iln use, the upper end of the assembly will be positioned on the lower end of the tubular conduit 01' a swab. An operator can then run the swab into the well and the valves 8 and 9 will move upwardly, permitting the passage of the fluid through and above the swab. lo the event that the swa s: run great a distance into the well, so that the amount of fluid located above the swab is of too great weight for the strength of the supporting wire line, then inrthat event the valve 9 will become unseated under the ex- *cess weight and the fluid will pass therethrough and back into the Well. The estimated weight of material for releasing the valve 9 can be determined and regulated by means of the lock nut 22, the adjustment of which will vary the tension of the spring 23, against the tension of which the valve 9 opens. Attention is directed to the fact that by virtue of the novel arrangement and construction of the valve members 8 and 9, the entire passage through the casing is opened when the swab is being lowered into the well. This arrangement eliminates any retarding effect onthe movement of the swab and permits the usual rapid movement of same.

The provision of the screen 21 which. surrounds the spring, prevents rubber or other foreign material, which might be in the oil from going through the relief valve seat and thus causing the valve to stand open. The two valves and the screen are kept in alignment and positioned with relation to each other by the meansheretofore mentioned. The screen is kept open and clean by the passage of the fluid when lowering the swab into the well.

The present invention may readily be adapted for use in any instance where a relief valve is essential.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:

A swab unloader, comprising a tubular casing having a stationary valve seat therein, a reciprocating rod arranged within the casing and guide-d by the latter, a main valve loosely mounted on the rod and engageable with said seat, said valve having an opening therethrough and a valve seat, an auxiliary valve fixed on the rod and engageable with the l ast mentioned seat, a nut adjustiably mounted on said rod, an annular screen surrounding the rod and slidably engaging the main valve, :1 cap at one end of the screen engaging said nut, and a coiled spring arranged within the screen and having one of its ends engaging said cap and its other end engaging the main valve, for normally holding the auxiliary valve in closed posit-ion.

In testimony whereof I afiix my signature.

HARVEY R. STA NDLEE. 

